Radon on selected underground tourist routes in Poland

摘要

The underground tourist routes, such as caves, old mines, building constructions under old towns and dungeons are the environments with potential radon concentrations that may exceed several thousand times the atmospheric concentrations. In Poland there are over thirty underground tourist routes, but radon concentrations are measured only in few of them. Among other routes, the following should be singled out: the drift of the former Kowary uranium mine and Niedzwiedzia Cave located near Kletno (the Sudetes). In the former, the mean annual radon concentration is of the order of 500 Bq m~(-3), and in the latter it reaches over 2000 Bq m~(-3).